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Battery Eater is a benchmark for your's laptop battery pack.

Battery Eater is a testing tool intended to reveal the potential of a notebook battery pack. Battery Eater can measure the minimum operation time of a notebook (when all power-saving options are disabled) under conditions close to the maximum workload (Classic mode). You should be aware, though, that such conditions rarely occur during an ordinary use of a notebook and should be regarded as reflecting the minimum time the notebook can work on its battery. Battery Eater will show a result closest to the maximum possible in the "Idle" and in the "Reader's Test" mode (when all power-saving options are fully enabled).